/* Kernel module to match EUI64 address parameters. */
/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ipv6.h>
#include <linux/if_ether.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
MODULE_DESCRIPTION("IPv6 EUI64 address checking match");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
static int
match(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const struct xt_match *match,
const void *matchinfo,
int offset,
unsigned int protoff,
int *hotdrop)
{
unsigned char eui64[8];
int i = 0;
if (!(skb->mac.raw >= skb->head &&
(skb->mac.raw + ETH_HLEN) <= skb->data) &&
offset != 0) {
*hotdrop = 1;
return 0;
}
memset(eui64, 0, sizeof(eui64));
if (eth_hdr(skb)->h_proto == htons(ETH_P_IPV6)) {
if (skb->nh.ipv6h->version == 0x6) {
memcpy(eui64, eth_hdr(skb)->h_source, 3);
memcpy(eui64 + 5, eth_hdr(skb)->h_source + 3, 3);
eui64[3] = 0xff;
eui64[4] = 0xfe;
eui64[0] |= 0x02;
i = 0;
while ((skb->nh.ipv6h->saddr.s6_addr[8+i] == eui64[i])
&& (i < 8))
i++;
if (i == 8)
return 1;
static struct ip6t_match eui64_match = {
.name = "eui64",
.match = match,
.matchsize = sizeof(int),
.hooks = (1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_IN) |
(1 << NF_IP6_FORWARD),
.me = THIS_MODULE,
};
static int __init ip6t_eui64_init(void)
return ip6t_register_match(&eui64_match);
static void __exit ip6t_eui64_fini(void)
ip6t_unregister_match(&eui64_match);
module_init(ip6t_eui64_init);
module_exit(ip6t_eui64_fini);